MML can stand for:

Academia

  • Master of Modern Languages, an undergraduate degree offered by the University of Manchester, which includes the study of two modern languages to Master's level
  • Medieval and Modern Languages, an undergraduate degree offered by the Faculty of Medieval and Modern Languages, University of Oxford (FMML)
  • Modern and Medieval Languages, an undergraduate degree offered by (and the corresponding faculty at) the University of Cambridge

Computer programming

  • Medical Markup Language, an application of Extensible Markup Language (XML)
  • MML (language), man-machine language, a computer language
  • Modeling Maturity Level, a scale to indicate to which degree an architecture uses models (used in software development)
  • Music Macro Language, a music notation format used in producing music for personal computers and video game systems
  • Music Markup Language, an application of Extensible Markup Language (XML)
  • An abbreviation for the voice over IP application Mumble, primarily designed for use by Scottermac (mml)

Forums, organizations, or companies

  • Maskew Miller Longman, a South African publishing company owned by Maskew Miller Learning.
  • Michigan Municipal League, a non-profit organization representing Michigan cities, villages and urban townships
  • MML Capital Partners an international investment company
  • Material Measurement Laboratory, a NIST laboratory since 2010
  • Milli Muslim League, now the Pakistan Markazi Muslim League (PMML), an Islamist political party in Pakistan, front for the militant group Lashkar-e-Taiba

Mathematics

  • 2050 in Roman numerals
  • Minimum Message Length, a form of unbiased statistical modeling based on information theory
  • MyMathLab, an online education platform, developed by Pearson Education, for teaching and learning mathematics

Transportation

  • The IATA airport code for Southwest Minnesota Regional Airport
  • The Midland Main Line, a main line railway in the United Kingdom
  • Midland Mainline (train operating company), a former train operating company that operated the Midland Main Line franchise.
  • Midland Line (disambiguation), for other uses

Others

  • Myeloid/lymphoid or mixed-lineage leukemia
  • Multi-Mission Launcher, an American missile launcher
  • Middlesbrough Music Live, a music festival in Middlesbrough, England
  • Metropolitan Municipality of Lima (), the government institution in charge of the metropolitan area of Lima, Peru
  • "MML", level from PlayStation 3 video game Haze
  • Mega Man Legends, a videogame series part of the Mega Man franchise.